Workshop Technology
In a four high rolling mill, there are four rolls out of which

Three are working rolls and one is backing up roll
All of the four are working rolls
Two are working rolls and two are backing up rolls
One is working roll and three are backing up rolls

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Workshop Technology
The welding set up is said to have straight polarity, when

Work is connected to the positive terminal and the electrode holder is earthed
Work is connected to the positive terminal and the electrode holder to the negative terminal
Work is connected to the negative terminal and the electrode holder to the positive terminal
Work is connected to the negative terminal and the electrode holder is earthed

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Workshop Technology
Shift is a casting defect which

Occurs near the ingates as rough lumps on the surface of a casting
Occurs as sand patches on the upper surface of a casting
Results in general enlargement of a casting
Results in a mismatching of the top and bottom parts of a casting

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